WO2019037306A1 - 像素驱动电路及其驱动方法 - Google Patents

像素驱动电路及其驱动方法 Download PDF

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WO2019037306A1
WO2019037306A1 PCT/CN2017/111428 CN2017111428W WO2019037306A1 WO 2019037306 A1 WO2019037306 A1 WO 2019037306A1 CN 2017111428 W CN2017111428 W CN 2017111428W WO 2019037306 A1 WO2019037306 A1 WO 2019037306A1
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control signal
node
thin film
film transistor
high level
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French (fr)
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周学兵
陈小龙
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US15/580,273 priority Critical patent/US10311794B2/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel driving circuit and a driving method thereof.
  • organic light-emitting diode (OLED) display panels are favored by the market because of their low power consumption, high color gamut, high brightness, high resolution, wide viewing angle, and high response speed.
  • the OLED display device can be classified into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED) according to the driving method.
  • PMOLED passive matrix OLED
  • AMOLED active matrix OLED
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • AMOLED is a current-driven device. The brightness is determined by the current flowing through the OLED itself.
  • Most existing chips (IC) only transmit voltage signals, so the AMOLED pixel driving circuit must complete the task of converting the voltage signal into a current signal.
  • the 2T1C finger circuit mainly includes two thin film transistors (TFTs) and one capacitor (C), wherein one thin film transistor T2 is a switching TFT controlled by a scanning signal SCAN for control.
  • the entry of the data signal (DATA) is a charging switch for controlling the capacitor Cst
  • the other thin film transistor T1 is a driving TFT for driving the OLED to control the current through the OLED.
  • the capacitor Cst is mainly used to store the DATA signal and thereby control the T1 to the OLED. Drive current.
  • the scan signal SCAN may be from a gate driver corresponding to a certain row of scan lines, and the data signal DATA may be from a source driver corresponding to a column of data lines.
  • OVDD is the high potential of the power supply
  • OVSS is the low potential of the power supply.
  • the AMOLED panel (2T1C pixel circuit) has a driving TFT (T1 in FIG. 1) threshold voltage Vth which will drift or change in electron mobility with changes in operating time and driving current; drift or aging of the driving TFT threshold voltage Vth will There is a significant difference in the current Id flowing through the OLED; the difference in OLED current directly leads to uneven brightness and inconsistency of the AMOLED panel; affecting the display quality and picture effect of the AMOLED panel.
  • Another object of the present invention is to provide a driving method of a pixel driving circuit that eliminates the influence of brightness inconsistency caused by a change in threshold voltage Vth of a driving TFT.
  • the present invention provides a pixel driving circuit comprising:
  • a first thin film transistor having a gate connected to the first node, the source and the drain being respectively connected to the power supply high potential and the second node;
  • a second thin film transistor having a gate connected to the first control signal, and a source and a drain connected to the first node and the second node, respectively;
  • a third thin film transistor having a gate connected to a second control signal, and a source and a drain respectively connected to the anode of the second node and the OLED;
  • the cathode is connected to the power supply at a low potential
  • a fourth thin film transistor having a gate connected to the first control signal, and a source and a drain respectively connected to the third node and the reference voltage;
  • a fifth thin film transistor having a gate connected to the first control signal, and a source and a drain respectively connected to the third node and the data signal;
  • a sixth thin film transistor having a gate connected to a third control signal, the source and the drain being respectively connected to the third node and the first node;
  • a first capacitor the two ends of which are respectively connected to the first node and the power source is high;
  • the potential of the reference voltage is less than the data signal.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fifth thin film transistor, and the sixth thin film transistor are P-type transistors, and the fourth thin film transistor is an N-type transistor.
  • the timings of the first control signal, the second control signal, and the third control signal are configured to include an initialization phase, a threshold voltage sensing phase, and an illumination phase.
  • the first control signal remains at a high level
  • the second control signal remains at a high level
  • the third control signal remains at a low level
  • the first control signal remains at a low level
  • the second control signal remains at a high level
  • the third control signal remains at a high level
  • the first control signal remains at a high level
  • the second control signal remains at a low level
  • the third control signal remains at a high level
  • the present invention also provides a driving method of the above pixel driving circuit, comprising: configuring timings of the first control signal, the second control signal, and the third control signal to include an initialization phase, a threshold voltage sensing phase, and an illumination phase.
  • the first control signal remains at a high level, and the second control signal Keeping high, the third control signal remains low.
  • the first control signal remains at a low level
  • the second control signal remains at a high level
  • the third control signal remains at a high level
  • the first control signal remains at a high level
  • the second control signal remains at a low level
  • the third control signal remains at a high level
  • the invention also provides a pixel driving circuit, comprising:
  • a first thin film transistor having a gate connected to the first node, the source and the drain being respectively connected to the power supply high potential and the second node;
  • a second thin film transistor having a gate connected to the first control signal, and a source and a drain connected to the first node and the second node, respectively;
  • a third thin film transistor having a gate connected to a second control signal, and a source and a drain respectively connected to the anode of the second node and the OLED;
  • the cathode is connected to the power supply at a low potential
  • a fourth thin film transistor having a gate connected to the first control signal, and a source and a drain respectively connected to the third node and the reference voltage;
  • a fifth thin film transistor having a gate connected to the first control signal, and a source and a drain respectively connected to the third node and the data signal;
  • a sixth thin film transistor having a gate connected to a third control signal, the source and the drain being respectively connected to the third node and the first node;
  • a first capacitor the two ends of which are respectively connected to the first node and the power source is high;
  • the potential of the reference voltage is less than the data signal
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fifth thin film transistor, and the sixth thin film transistor are P-type transistors, and the fourth thin film transistor is an N-type transistor;
  • the timings of the first control signal, the second control signal, and the third control signal are configured to include an initialization phase, a threshold voltage sensing phase, and an illumination phase;
  • the first control signal remains at a high level
  • the second control signal remains at a high level
  • the third control signal remains at a low level
  • the first control signal remains at a low level
  • the second control signal remains at a high level
  • the third control signal remains at a high level
  • the pixel driving circuit and the driving method thereof according to the present invention use an internal sensing method to eliminate the influence of brightness inconsistency caused by a change in the threshold voltage Vth of the driving TFT based on the 6T2C pixel driving circuit.
  • 1 is a schematic diagram of a conventional 2T1C pixel driving circuit
  • FIG. 2 is a schematic circuit diagram of a pixel driving circuit according to a preferred embodiment of the present invention.
  • FIG. 3 is a timing diagram of a preferred embodiment of a pixel driving circuit of the present invention.
  • FIG. 4 is a schematic diagram showing the working state of a preferred embodiment of the pixel driving circuit of the present invention in an initialization phase
  • FIG. 5 is a schematic diagram showing the working state of a pixel driving circuit in a threshold voltage sensing phase according to a preferred embodiment of the present invention
  • FIG. 6 is a schematic diagram showing the working state of a preferred embodiment of the pixel driving circuit of the present invention in an illuminating phase.
  • FIG. 2 is a schematic circuit diagram of a pixel driving circuit according to a preferred embodiment of the present invention
  • FIG. 3 is a timing diagram thereof.
  • the circuit of the preferred embodiment is a 6T2C pixel driving circuit, wherein the thin film transistors T1, T2, T3, T5, and T6 are P-type transistors, and T4 is an N-type transistor, and T1 is The driving transistor; S1, S2, and S3 are pixel driving circuit control ports for inputting control signals to control driving of the pixel driving circuit.
  • the invention provides a novel 6T2C pixel driving circuit and a driving TFT threshold voltage Vth compensation driving method.
  • the pixel driving circuit mainly comprises: a thin film transistor T1, a gate connection node G, a source and a drain respectively connected to the power supply high potential OVDD and the node K; a thin film transistor T2, a gate connection control signal S1, and a source and a drain respectively connected Nodes G and K; thin film transistor T3, whose gate is connected to control signal S2, source and drain are respectively connected to node K and anode of OLED; cathode of OLED is connected to power supply low potential OVSS; thin film transistor T4 is connected with gate control signal S1, the source and the drain are respectively connected to the node N and the reference voltage Vref; the thin film transistor T5 has a gate connected to the control signal S1, the source and the drain are respectively connected to the node N and the data signal Vdata; and the thin film transistor T6 is connected to the gate thereof The control signal S3, the source and the drain
  • the pixel driving process of the pixel driving circuit of the present invention can be divided into three stages: The first stage is the initialization phase of the driver circuit (Initialize); the second stage is the Vth sensing stage (Vth Sensing); the third stage is the OLED lighting stage (Emitting).
  • FIG. 4 there is shown a schematic diagram of the operational state of the preferred embodiment during the initialization phase.
  • S1 remains high while S2 remains high and S3 remains low.
  • FIG. 5 it is a schematic diagram of the operating state of the preferred embodiment in the threshold voltage sensing phase.
  • S1 goes low, S2 remains high, and S3 goes high.
  • FIG. 6 there is shown a schematic diagram of the operational state of the preferred embodiment in the illumination phase.
  • S1 goes back to high level
  • S2 goes low
  • S3 stays high.
  • T1, T3, and T4 are turned on
  • T2, T5, and T6 are turned off.
  • Vg (OVDD-Vth)-(Vdata-Vref)*C2/(C1+C2);
  • Vs OVDD
  • the current Id flowing through the OLED/QLED device is:
  • K K((Vdata-Vref)*C2/(C1+C2)) 2 , where K is a constant.
  • Id is only related to Vdata, Vref and C1, C2, and has nothing to do with Vth; in particular, when the parameters of Vref, C1, and C2 are fixed, the current Id is only related to Vdata; The purpose is to achieve compensation for Vth.
  • the present invention further provides a driving method of the above pixel driving circuit, by configuring timings of the first control signal, the second control signal, and the third control signal to include an initialization phase, a threshold voltage sensing phase, and an illumination phase
  • the control signal can realize the drive control of the flat display and the panel.
  • the pixel driving circuit and the driving method thereof according to the present invention use an internal sensing method to eliminate the influence of brightness inconsistency caused by a change in the threshold voltage Vth of the driving TFT based on the 6T2C pixel driving circuit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

一种像素驱动电路及其驱动方法, 采用内部感测方法来消除驱动TFT阈值电压Vth变化所带来的亮度不一致的影响。像素驱动电路包括：第一薄膜晶体管(T1)，连接第一节点(G)和第二节点(K)；第二薄膜晶体管(T2)，连接第一控制信号(S1)，第一节点(G)和第二节点(K)；第三薄膜晶体管(T3)，连接第二控制信号(S2)和第二节点(K)；第四薄膜晶体管(T4)，连接第一控制信号(S1)，第三节点(N)和参考电压(Vref)；第五薄膜晶体管(T5)，连接第一控制信号(S1)，第三节点(N)和数据信号(Vdata)；第六薄膜晶体管(T6)，连接第三控制信号(S3)；第一电容(C1)和第二电容(C2)；参考电压(Vref)的电位小于数据信号(Vdata)。

Description

像素驱动电路及其驱动方法 技术领域
本发明涉及显示技术领域，尤其涉及一种像素驱动电路及其驱动方法。
背景技术
作为新一代显示技术，有机发光二极管(OLED)显示面板具有低功耗、高色域、高亮度、高分辨率、宽视角、高响应速度等优点，因此备受市场的青睐。
OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。AMOLED是电流驱动器件，亮度由流过OLED自身的电流决定，大部分已有芯片(IC)都只传输电压信号，故AMOLED像素驱动电路要完成将电压信号转变为电流信号的任务。
参见图1，其为传统2T1C像素驱动电路示意图，2T1C指电路主要包括两个薄膜晶体管(TFT)和一个电容(C)，其中一个薄膜晶体管T2为开关TFT，由扫描信号SCAN控制，用于控制数据信号(DATA)的进入，是控制电容Cst的充电开关，另一个薄膜晶体管T1为驱动TFT，用于驱动OLED，控制通过OLED的电流，电容Cst主要是用来存储DATA信号进而控制T1对OLED的驱动电流。扫描信号SCAN可以来自于栅极驱动器，对应于某一行扫描线，数据信号DATA可以来自于源极驱动器，对应于某一列数据线。OVDD为电源高电位，OVSS为电源低电位。
AMOLED面板(2T1C像素电路)其驱动TFT(图1中为T1)阈值电压Vth将随工作时间及驱动电流的变化而发生漂移现象或者电子迁移率的变化；驱动TFT阈值电压Vth的漂移或老化将导致流过OLED的电流Id存在明显的差异；OLED电流的差异直接导致AMOLED面板的亮度不均匀与不一致；影响AMOLED面板显示质量与画面效果。
发明内容
因此，本发明的目的在于提供一种像素驱动电路，消除驱动TFT阈值电压Vth变化所带来的亮度不一致的影响。
本发明的另一目的在于提供一种像素驱动电路的驱动方法，消除驱动TFT阈值电压Vth变化所带来的亮度不一致的影响。
为实现上述目的，本发明提供了一种像素驱动电路，包括：
第一薄膜晶体管，其栅极连接第一节点，源极和漏极分别连接电源高电位和第二节点；
第二薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第一节点和第二节点；
第三薄膜晶体管，其栅极连接第二控制信号，源极和漏极分别连接第二节点和OLED的阳极；
OLED，其阴极连接电源低电位；
第四薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和参考电压；
第五薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和数据信号；
第六薄膜晶体管，其栅极连接第三控制信号，源极和漏极分别连接第三节点和第一节点；
第一电容，其两端分别连接第一节点和电源高电位；
第二电容，其两端分别连接第一节点和第三节点；
该参考电压的电位小于数据信号。
其中，该第一薄膜晶体管，第二薄膜晶体管，第三薄膜晶体管，第五薄膜晶体管，以及第六薄膜晶体管为P型晶体管，该第四薄膜晶体管为N型晶体管。
其中，所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段。
其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号保持高电平，第三控制信号保持低电平。
其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
其中，在发光阶段，所述第一控制信号保持高电平，第二控制信号保持低电平，第三控制信号保持高电平。
本发明还提供了上述像素驱动电路的驱动方法，包括：所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段。
其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号 保持高电平，第三控制信号保持低电平。
其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
其中，在发光阶段，所述第一控制信号保持高电平，第二控制信号保持低电平，第三控制信号保持高电平。
本发明还提供一种像素驱动电路，包括：
第一薄膜晶体管，其栅极连接第一节点，源极和漏极分别连接电源高电位和第二节点；
第二薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第一节点和第二节点；
第三薄膜晶体管，其栅极连接第二控制信号，源极和漏极分别连接第二节点和OLED的阳极；
OLED，其阴极连接电源低电位；
第四薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和参考电压；
第五薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和数据信号；
第六薄膜晶体管，其栅极连接第三控制信号，源极和漏极分别连接第三节点和第一节点；
第一电容，其两端分别连接第一节点和电源高电位；
第二电容，其两端分别连接第一节点和第三节点；
该参考电压的电位小于数据信号；
其中，该第一薄膜晶体管，第二薄膜晶体管，第三薄膜晶体管，第五薄膜晶体管，以及第六薄膜晶体管为P型晶体管，该第四薄膜晶体管为N型晶体管；
其中，所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段；
其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号保持高电平，第三控制信号保持低电平；
其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
综上，本发明的像素驱动电路及其驱动方法，基于6T2C像素驱动电路，采用内部感测方法来消除驱动TFT阈值电压Vth变化所带来的亮度不一致的影响。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为传统2T1C像素驱动电路示意图；
图2为本发明像素驱动电路一较佳实施例的电路示意图；
图3为本发明像素驱动电路一较佳实施例的时序示意图；
图4为本发明像素驱动电路一较佳实施例在初始化阶段的工作状态示意图；
图5为本发明像素驱动电路一较佳实施例在阈值电压感测阶段的工作状态示意图；
图6为本发明像素驱动电路一较佳实施例在发光阶段的工作状态示意图。
具体实施方式
参见图2及图3，图2为本发明像素驱动电路一较佳实施例的电路示意图，图3为其时序示意图。该较佳实施例的电路为6T2C像素驱动电路，其中薄膜晶体管T1、T2、T3、T5、T6为P型(P-type)晶体管，而T4为N型(N-type)晶体管，并且T1为驱动晶体管；S1、S2、S3为像素驱动电路控制端口，用于输入控制信号以控制像素驱动电路的驱动。
本发明提出一种新颖的6T2C像素驱动电路及驱动TFT阈值电压Vth补偿驱动方法。该像素驱动电路主要包括：薄膜晶体管T1，栅极连接节点G，源极和漏极分别连接电源高电位OVDD和节点K；薄膜晶体管T2，栅极连接控制信号S1，源极和漏极分别连接节点G和K；薄膜晶体管T3，其栅极连接控制信号S2，源极和漏极分别连接节点K和OLED的阳极；OLED的阴极连接电源低电位OVSS；薄膜晶体管T4，其栅极连接控制信号S1，源极和漏极分别连接节点N和参考电压Vref；薄膜晶体管T5，其栅极连接控制信号S1，源极和漏极分别连接节点N和数据信号Vdata；薄膜晶体管T6，其栅极连接控制信号S3，源极和漏极分别连接节点N和节点G；电容C1，其两端分别连接节点G和电源高电位OVDD；电容C2，其两端分别连接节点G和N；在此较佳实施例中，该参考电压Vref的电位小于数据信号Vdata。
参见图3，本发明的像素驱动电路的像素驱动过程，可分为三个阶段： 第一阶段为驱动电路初始化阶段(Initialize)；第二阶段为Vth感测阶段(Vth Sensing)；第三阶段为OLED发光阶段(Emitting)。
参见图4，其为该较佳实施例在初始化阶段的工作状态示意图。在此阶段中，S1保持高电平，同时S2保持高电平，S3保持低电平。在初始化阶段，T4、T6导通，而T1、T2、T3、T5保持截止；在初始化阶段，G点电位Vg＝Vref；N点电位Vn＝Vref；S点电位Vs＝OVDD。
参见图5，其为该较佳实施例在阈值电压感测阶段的工作状态示意图。在此阶段中，S1变为低电平，S2仍保持高电平，S3转变为高电平。在Vth感测阶段，T2、T5导通，T4、T6变为截止；T1导通直至Vg电位为OVDD－Vth后再次截止；T3仍保持截止，OLED不能发光；实现对T1阈值电压Vth的感测；N点电位Vn＝Vdata；Vs＝OVDD；而G点电位将变成Vg＝OVDD–Vth。
参见图6，其为该较佳实施例在发光阶段的工作状态示意图。在此阶段中，S1变回高电平，S2变为低电平，S3保持高电平。在OLED发光阶段，T1、T3、T4导通，T2、T5、T6截止。
在此阶段，N点电位归为Vn＝Vref；而G点电位因电容C1、C2耦合作用Vg＝OVDD－Vth－dV；其中dV＝(Vdata－Vref)*C2/(C1+C2)；
Vg＝(OVDD－Vth)－(Vdata－Vref)*C2/(C1+C2)；
Vs＝OVDD；
则流经OLED/QLED器件的电流Id为：
Id＝K(Vsg-Vth)2
＝K(OVDD－(OVDD－Vth－dV)－Vth)2
＝K(dV)2
＝K((Vdata－Vref)*C2/(C1+C2))2，其中K为常数。
由OLED的Id电流公式可知，Id只与Vdata、Vref及C1、C2有关，与Vth无关；特别的是，当Vref、C1、C2参数固定时，电流Id只与Vdata有关；因此达到消除Vth变化的目的，实现对Vth的补偿。
本发明还相应提供了上述像素驱动电路的驱动方法，通过将所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段的控制信号，可以实现平面显示器、面板的驱动控制。
综上，本发明的像素驱动电路及其驱动方法，基于6T2C像素驱动电路，采用内部感测方法来消除驱动TFT阈值电压Vth变化所带来的亮度不一致的影响。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (12)

  1. 一种像素驱动电路，包括：
    第一薄膜晶体管，其栅极连接第一节点，源极和漏极分别连接电源高电位和第二节点；
    第二薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第一节点和第二节点；
    第三薄膜晶体管，其栅极连接第二控制信号，源极和漏极分别连接第二节点和OLED的阳极；
    OLED，其阴极连接电源低电位；
    第四薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和参考电压；
    第五薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和数据信号；
    第六薄膜晶体管，其栅极连接第三控制信号，源极和漏极分别连接第三节点和第一节点；
    第一电容，其两端分别连接第一节点和电源高电位；
    第二电容，其两端分别连接第一节点和第三节点；
    该参考电压的电位小于数据信号。
  2. 如权利要求1所述的像素驱动电路，其中，该第一薄膜晶体管，第二薄膜晶体管，第三薄膜晶体管，第五薄膜晶体管，以及第六薄膜晶体管为P型晶体管，该第四薄膜晶体管为N型晶体管。
  3. 如权利要求1所述的像素驱动电路，其中，所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段。
  4. 如权利要求3所述的像素驱动电路，其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号保持高电平，第三控制信号保持低电平。
  5. 如权利要求3所述的像素驱动电路，其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
  6. 如权利要求3所述的像素驱动电路，其中，在发光阶段，所述第一控制信号保持高电平，第二控制信号保持低电平，第三控制信号保持高电 平。
  7. 一种如权利要求1所述像素驱动电路的驱动方法，包括：所述第一控制信号，第二控制信号，以及第三控制信号的时序配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段。
  8. 如权利要求7所述的像素驱动电路的驱动方法，其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号保持高电平，第三控制信号保持低电平。
  9. 如权利要求7所述的像素驱动电路的驱动方法，其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
  10. 如权利要求7所述的像素驱动电路的驱动方法，其中，在发光阶段，所述第一控制信号保持高电平，第二控制信号保持低电平，第三控制信号保持高电平。
  11. 一种像素驱动电路，包括：
    第一薄膜晶体管，其栅极连接第一节点，源极和漏极分别连接电源高电位和第二节点；
    第二薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第一节点和第二节点；
    第三薄膜晶体管，其栅极连接第二控制信号，源极和漏极分别连接第二节点和OLED的阳极；
    OLED，其阴极连接电源低电位；
    第四薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和参考电压；
    第五薄膜晶体管，其栅极连接第一控制信号，源极和漏极分别连接第三节点和数据信号；
    第六薄膜晶体管，其栅极连接第三控制信号，源极和漏极分别连接第三节点和第一节点；
    第一电容，其两端分别连接第一节点和电源高电位；
    第二电容，其两端分别连接第一节点和第三节点；
    该参考电压的电位小于数据信号；
    其中，该第一薄膜晶体管，第二薄膜晶体管，第三薄膜晶体管，第五薄膜晶体管，以及第六薄膜晶体管为P型晶体管，该第四薄膜晶体管为N型晶体管；
    其中，所述第一控制信号，第二控制信号，以及第三控制信号的时序 配置为包括初始化阶段，阈值电压感测阶段，以及发光阶段；
    其中，在初始化阶段，所述第一控制信号保持高电平，第二控制信号保持高电平，第三控制信号保持低电平；
    其中，在阈值电压感测阶段，所述第一控制信号保持低电平，第二控制信号保持高电平，第三控制信号保持高电平。
  12. 如权利要求11所述的像素驱动电路，其中，在发光阶段，所述第一控制信号保持高电平，第二控制信号保持低电平，第三控制信号保持高电平。
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